AUTHOR=Li Xinghua , Feng Mingde , Wang Jiafu , Meng Yueyu , Yang Jiaheng , Liu Tonghao , Zhu Ruichao , Qu Shaobo 

TITLE=Suppressing Edge Back-Scattering of Electromagnetic Waves Using Coding Metasurface Purfle

JOURNAL=Frontiers in Physics

VOLUME=Volume 8 - 2020

YEAR=2020

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2020.578295

DOI=10.3389/fphy.2020.578295

ISSN=2296-424X

ABSTRACT=Edge scattering is one of the main scattering sources for metal objects, especially for those with thin front edges. In this paper, we propose to suppress the edge back-scattering of electromagnetic (EM) waves using coding metasurface purfle, which based on the principle of scattering cancellation, rather than absorption. To this end, two split-ring resonators (SRRs) are designed to have a π phase difference, as the 0- and 1-element of the coding metasurface. The coding metasurface is fixed on the front edge of a thin metal plate, and the back-scattering of front edge is significant for EM waves polarized along the edge direction. Due to the anti-phase scattering of the two coding elements, the back-scattering of the edge is suppressed by right of the scattering cancellation along the normal of the edge. Both the simulation and experiment results verify the reduced back-scattering of the flat edge. A maximal reduction of 24dB is attained within the central frequency of about 11 GHz. This work provides a new way of suppressing edge scattering and may find applications in EM compatibility, radar stealth technologies, etc.